diff --git a/pkgs/development/python-modules/jupyter-server-ydoc/default.nix b/pkgs/development/python-modules/jupyter-server-ydoc/default.nix
index 0a94adc31860..a60f74aefbdd 100644
--- a/pkgs/development/python-modules/jupyter-server-ydoc/default.nix
+++ b/pkgs/development/python-modules/jupyter-server-ydoc/default.nix
@@ -3,6 +3,7 @@
 , pythonOlder
 , fetchFromGitHub
 , hatchling
+, pythonRelaxDepsHook
 , jupyter-server-fileid
 , jupyter-ydoc
 , ypy-websocket
@@ -31,6 +32,11 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [
     hatchling
+    pythonRelaxDepsHook
+  ];
+
+  pythonRelaxDeps = [
+    "ypy-websocket"
   ];
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/ypy-websocket/default.nix b/pkgs/development/python-modules/ypy-websocket/default.nix
index 843c42b6283c..11b0b3b00707 100644
--- a/pkgs/development/python-modules/ypy-websocket/default.nix
+++ b/pkgs/development/python-modules/ypy-websocket/default.nix
@@ -3,8 +3,8 @@
 , pythonOlder
 , fetchFromGitHub
 , hatchling
-, aiofiles
 , aiosqlite
+, anyio
 , y-py
 , pytest-asyncio
 , pytestCheckHook
@@ -14,7 +14,7 @@
 
 buildPythonPackage rec {
   pname = "ypy-websocket";
-  version = "0.8.4";
+  version = "0.9.0";
   format = "pyproject";
 
   disabled = pythonOlder "3.7";
@@ -23,7 +23,7 @@ buildPythonPackage rec {
     owner = "y-crdt";
     repo = "ypy-websocket";
     rev = "refs/tags/v${version}";
-    hash = "sha256-jl2ciIA3enJRfPgcu96MZN+BmNL+bBet54AFDBy3seY=";
+    hash = "sha256-dHcXJavzR1BDAM9Xjm144gfNMSDEkenumI3POBfCjvQ=";
   };
 
   pythonRelaxDeps = [
@@ -36,8 +36,8 @@ buildPythonPackage rec {
   ];
 
   propagatedBuildInputs = [
-    aiofiles
     aiosqlite
+    anyio
     y-py
   ];
 
@@ -57,7 +57,7 @@ buildPythonPackage rec {
   ];
 
   meta = {
-    changelog = "https://github.com/y-crdt/ypy-websocket/blob/${version}/CHANGELOG.md";
+    changelog = "https://github.com/y-crdt/ypy-websocket/blob/${src.rev}/CHANGELOG.md";
     description = "WebSocket Connector for Ypy";
     homepage = "https://github.com/y-crdt/ypy-websocket";
     license = lib.licenses.mit;